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dell-laptop: Clear buffer before each SMBIOS call

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Make sure that before initializing SMBIOS call, the input buffer does
not contain any garbage (e.g. values from previous SMBIOS call). This
fixes problems with passing undefined/random parameters to SMBIOS
functions.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
This commit is contained in:
Pali Rohár 2015-07-06 12:08:55 +02:00 committed by Darren Hart
parent b78fb51b68
commit ced53f6d12
1 changed files with 10 additions and 1 deletions
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11
drivers/platform/x86/dell-laptop.c
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@ -311,10 +311,15 @@ static DEFINE_MUTEX(buffer_mutex);
static int hwswitch_state;
static void clear_buffer(void)
{
memset(buffer, 0, sizeof(struct calling_interface_buffer));
}
static void get_buffer(void)
{
mutex_lock(&buffer_mutex);
memset(buffer, 0, sizeof(struct calling_interface_buffer));
clear_buffer();
}
static void release_buffer(void)
@ -558,6 +563,8 @@ static int dell_rfkill_set(void *data, bool blocked)
!(buffer->output[1] & BIT(16)))
disable = 1;
clear_buffer();
buffer->input[0] = (1 | (radio<<8) | (disable << 16));
dell_send_request(buffer, 17, 11);
@ -572,6 +579,7 @@ static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
if (status & BIT(0)) {
/* Has hw-switch, sync sw_state to BIOS */
int block = rfkill_blocked(rfkill);
clear_buffer();
buffer->input[0] = (1 | (radio << 8) | (block << 16));
dell_send_request(buffer, 17, 11);
} else {
@ -774,6 +782,7 @@ static int __init dell_setup_rfkill(void)
get_buffer();
dell_send_request(buffer, 17, 11);
status = buffer->output[1];
clear_buffer();
buffer->input[0] = 0x2;
dell_send_request(buffer, 17, 11);
hwswitch_state = buffer->output[1];